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Old 05-04-2013, 10:19 PM
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Identify Holley Carb

I have a Holley Carb with these numbers 6R 5643B and no other identifying marks (except 255 on a butterfly) -- It's mounting dimension appear identical to Edelbrock, the secondaries and primaries are both 1 7/16" diameter. The secondaries are opened by a mechanical link. Can you tell me the model number for parts purposes and the CFM?
My application is street only on a near stock 1994 4.3L chevy V6 in a light car with manual transmission. As it is currently configured the linkage is pretty progressive, the primaries are 65% open before the secondaries start opening. I was thinking that perhaps I could disconnect the linkage to the secondaries and use it as a two barrel if it is too big for this engine
I know very little about this so any help will be gratefully appreciated.

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Old 05-05-2013, 05:23 AM
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check this out and see if this is your carb pictured.
holley identification?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network
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Old 05-05-2013, 09:19 AM
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It certainly looks like the same carb and some of the numbers match --- If truly a 450 should be ideal for my car -- THANKS!
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Old 05-05-2013, 01:52 PM
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Unfortunately the rebuild kit mentioned in the article I was directed to is not correct for this carb -- Help is still needed
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